Dave - 2007-08-06

Did not see this mentioned anywhere in the forums but found the discussion in the Mailing lists: 
http://sourceforge.net/mailarchive/forum.php?forum_name=mailmanager-users

Possible work around for this problem was to modify the my.cnf file for mysqld and add: set-variable=wait_timeout=45

Mailmanager is checking for email every 60 seconds so even if a lock happens it is cleared for the next cron check.

Seems to be working.